19-11-2012, 06:15 PM
REMOTE CONTROL FOR HOME APPLIANCES
REMOTECONTROLFOR.pdf (Size: 115.47 KB / Downloads: 29)
Connect this circuit to any of
your home appliances (lamp,
fan, radio, etc) to make the
appliance turn on/off from a TV, VCD
or DVD remote control. The circuit can
be activated from up to 10 metres.
The 38kHz infrared (IR) rays
generated by the remote
control are received
by IR receiver
module TSOP1738 of
the circuit. Pin 1 of
TSOP1738 is connected
to ground, pin 2 is connected
to the power
supply through resistor
R5 and the output
is taken from pin 3. The
output signal is amplified
by transistor T1
(BC558).
The amplified signal
is fed to clock pin 14 of decade
counter IC CD4017 (IC1). Pin 8 of IC1
is grounded, pin 16 is connected to Vcc
and pin 3 is connected to LED1 (red),
which glows to indicate that the appliance
is ‘off.’
The output of IC1 is taken from its
pin 2. LED2 (green) connected to pin 2
is used to indicate the ‘on’ state of the
appliance. Transistor T2 (BC548) connected
to pin 2 of IC1 drives relay RL1.
Diode 1N4007 (D1) acts as a freewheeling
diode. The appliance to be controlled
is connected between the pole of
the relay and neutral terminal of mains.
It gets connected to live terminal of AC
mains via normally opened (N/O) contact
when the relay energises.